81% (2000)

67% (2011)

73% (2004)

70% (2001)

58% (2012)

70% (2005)

58% (2009)

78% (1998)

55% (2013)

71% (1992)

75% (1995)

68% (2001)

77% (1988)

43% (2003)

64% (2010)

59% (1994)

57% (1987)

55% (2008)

67% (1999)

56% (2017)